Method for manufacturing solids containing modified calcium fluoride

Abstract

This invention relates to a method for manufacturing a solid containing modified calcium fluoride. The method involves separating the silicon compound and aluminum compound from a calcium fluoride-containing solid containing calcium fluoride, silicon compound, and aluminum compound, and manufacturing a solid containing modified calcium fluoride with reduced silicon and aluminum compounds. Furthermore, the method involves subjecting a slurry containing the calcium fluoride-containing solid and water to alkaline treatment at a temperature above 50°C, thereby dissolving the silicon compound and aluminum compound.